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With the popularity of various smart phones, tablet machine, more and more people find a variety of digital products, especially the power of the phone itself has been unable to meet our needs in the day-to-day use of a life time; And the emergence of mobile power can solve this problem to some extent. So for those who do not come into contact with the mobile power consumers an array of mobile power Portable mobile power pack going to choose? Good power, the key batteries will have to see. Internal batteries of mobile power like the car's fuel tank and transmission system, to provide a steady stream of power, is responsible for the entire mobile power directly determine the good and bad of mobile power. Phone mobile power supply circuit board can be seen as a control system, is used mainly responsible for power distribution and conversion, lithium batteries 3.7V (or higher) voltage is converted into a standard 5V (or higher) voltage to provide electricity for the charging apparatus. The main difference mobile power pack lies in the different electrolytes, wherein the liquid state lithium ion battery using a liquid electrolyte, the polymer lithium ion battery with a solid polymer electrolyte instead. Such polymers may be a "dry state", and may be a "colloidal", present, most polymer gel electrolyte. The lithium-ion battery, depending on the electrolyte material used, can be divided into two categories of liquid lithium ion battery (LI and lithium ion polymer batteries (LIP). Both positive and negative material is the same, cathode materials for lithium cobalt oxide, nickel usb power pack cobalt manganese and lithium iron phosphate material three kinds, is extremely negative graphite battery works basically the same.